If you open the game, you get a black screen and the game stops responding, here is a guide on how to fix black screen upon launch.
How to Fix the Black Screen in HyperParasite?
it happens because Dev updates some saving mechanics.
All you have to do is to go to:
%localappdata%\HyperParasite\Saved\SaveGames
and cancel the files within it.
That should work.
Sorry for the inconvenience.
Credit to Troglobytes Games
Features
Relentless top-down, shoot ‘em up action!
Being able to snatch the bodies of nearly every weapon-wielding homo sapien you encounter ensures bullet hell almost never ceases.
Intelligent zapping!
A happy trigger-finger alone won’t suffice; multiple character classes, host-specific abilities and a skill-based progression system means you’ll be working to one-up the human race even without bullets.
Extreme level re-playability
Procedurally generated levels, multiple game-play objectives, grueling waves of enemies and deranged bosses, all while the possibility of perma-death looms; prepare to die. A lot.
Nostalgia
…perpetuated by a unique 3D-pixelated art style, absurdly bright neons, obnoxious styling and robotic synthesizer sounds. It’s the roaring 80’s alright, with a dash of dystopia.